<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div class="box">我是文字的内容</div>
<script>
    const box = document.querySelector('.box');
    console.log(box.innerText);
    box.innerText = '我是修改后的内容';
    console.log(box.innerText);

</script>

</body>
</html>